Multi-speed transmission

ABSTRACT

A multi-speed transmission having seven forward and one reverse gear. An Input shaft couples sun gear of second gear set (P 2 ) and detachably couples shaft ( 5 ), which couples the carrier of third gear set (P 3 ) and shaft ( 4 ). Shaft ( 4 ) couples the carrier of second gear set (P 2 ) and detachably couples housing and shaft ( 6 ). Shaft ( 6 ) couples sun gear of third gear set (P 3 ) and ring gear of first gear set (P 1 ). Shaft ( 3 ) couples ring gear of second gear set (P 2 ) and carrier of first gear set (P 1 ). Sun gear of first gear set (P 1 ) is fixed to housing. Output shaft couples ring gear of third gear set (P 3 ). Either shaft ( 5 ) is detachably connected to housing (G) and shaft ( 3 ) is detachably connected to shaft ( 6 ) or shaft ( 3 ) is detachably connected to housing ( 3 ) and to shaft ( 5 ).

This applications claims priority from German Application Serial No. 10 2006 006 644.8 filed Feb. 14, 2006.

FIELD OF THE INVENTION

The present invention relates to a multi-speed transmission in planetary design, particularly an automatic transmission for a motor vehicle.

BACKGROUND OF THE INVENTION

According to the state of the art, automatic transmissions, particularly for motor vehicles, comprise planetary gear sets, which are shifted using friction elements and/or control elements, such as clutches and brakes, and which are typically connected to a starting element that is subject to a slip effect and optionally provided with a converter lock-up clutch, for example a hydrodynamic torque converter or a fluid clutch.

A transmission of this type is described in EP 0 434 525 A1. It comprises essentially one input shaft and one output shaft, which are disposed parallel to each other, a double planetary gear set concentric with the output shaft, and five control elements in the form of three clutches and two brakes, the selective operation of which, in pairs, determines different gear ratios between the input shaft and the output shaft. This transmission has a front-mounted gear set and two power paths, so that by the selective engagement in pairs of the five control elements, six forward gears are obtained.

In the first power path, two clutches are required for transmitting the torque from the front-mounted gear set to two elements of the double planetary gear set. These elements are provided in the power flow direction substantially behind the front-mounted gear set in the direction of the double planetary gear set. In the second power path, a further clutch is provided, which detachably connects this path with a further element of the double planetary gear set. The clutches are disposed such that the inner disk carrier forms the output end.

Furthermore, from the published prior art document U.S. Pat. No. 6,139,463 a compact multi-speed transmission in planetary design, particularly for a motor vehicle, is known, which has two planetary gear sets and one front-mounted gear set as well as three clutches and two brakes. In this known multi-speed transmission, two clutches C-1 and C-3 are provided in a first power path for transmitting torque from the front-mounted gear set to the two planetary gear sets. The outer disk carrier and/or the cylinder or piston and pressure compensation sides of the clutch C-3 are connected with a first brake B-1. Furthermore, the inner disk carrier of the third clutch C-3 is connected to the cylinder and/or piston and pressure compensation sides of the first clutch C-1, the inner disk carrier of the first clutch. C-1 being disposed on the output side and connected to a sun gear of the third planetary gear set.

From DE 199 49 507 A1 by the applicant, a multi-speed transmission is also known, according to which on the drive shaft two non-shiftable, front-mounted gear sets are provided, which on the output side generate two rotational speeds which, in addition to the rotational speed of the input shaft, can be switched by selectively engaging the control elements with a shiftable double planetary gear set that acts upon the output shaft, such that, for changing from one gear to the next higher or lower gear only one of the two actuated control elements, must be engaged or disengaged.

DE 199 12 480 A1 discloses an automatically shiftable motor vehicle transmission with three carrier-mounted planetary gear sets as well as three brakes and two clutches for switching between six forward gears and one reverse gear, and with one drive shaft and one output shaft. The automatically shiftable motor vehicle transmission is configured such that the drive shaft is directly connected to the sun gear of the second planetary gear set, and that the drive shaft can be connected, via the first clutch, to the sun gear of the first planetary gear set and/or, via the second clutch, to the carrier of the first planetary gear set. Additionally or alternatively, the sun gear of the first planetary gear set can be connected, via the first brake, to the transmission housing and/or the carrier of the first planetary gear set can be connected, via the second brake, to the housing and/or the sun gear of the third planetary gear set can be connected, via the third brake, to the housing.

Furthermore, DE 102 13 820 A1 discloses a multi-speed automatic transmission, comprising a first input path T1 of a first speed ratio, an input path T2, which has a larger speed ratio than the input path T1, a planetary gear set of four elements, which are arranged, in the direction of power flow, in the order of a first element, a second element, a third element and a fourth element, a clutch C-2 that transmits rotation from the input path T2 to the first element S3, a clutch C-1 that transmits rotation from the input path T2 to the fourth element S2, a clutch C-4 that transmits rotation from the input path T1 to the first element, a clutch C-3 that transmits rotation from the input path T1 to the second element C-3, a brake B-1 that engages the fourth element, a brake B-2 that engages the second element, and an output member that is coupled with the third element R3.

Within the scope of DE 101 15 983 A1 by the applicant, a multi-speed transmission is described, comprising a drive shaft that is linked with a front-mounted gear set, an output shaft that is connected with a rear-mounted gear set, and a maximum of seven control elements, through the selective shifting of which at least seven forward gears can be shifted without range shifting. The front-mounted gear set is formed by a front-mounted planetary gear set or a maximum of two non-shiftable front-mounted planetary gear sets that are linked with the first front-mounted planetary gear set, wherein the rear-mounted gear set is configured as a two-carrier four-shaft transmission with two shiftable rear-mounted planetary gear sets and has four free shafts. The first free shaft of this two-carrier four-shaft transmission is connected with the first control element, the second free shaft with the second and third control elements, the third free shaft with the fourth and fifth control elements, and the fourth free shaft is connected with the output shaft. According to the invention, a multi-speed transmission with a total of six control elements is proposed, which connect the third free shaft or the first free shaft of the rear-mounted gear set additionally with a sixth control element. For a multi-speed transmission with a total of seven control elements, it is proposed according to the invention that the third free shaft is additionally connected with a sixth control element D′ and the first free shaft additionally with a seventh control element.

Furthermore, the scope of DE 101 15 987 by the applicant describes a multi-speed transmission with at least seven gears. In addition to the input shaft and the output shaft, this transmission comprises a non-shiftable front-mounted gear set and a shiftable rear-mounted gear set in the form of a two-carrier four-shaft transmission. The front-mounted gear set comprises a first planetary gear set, which, in addition to the input rotational speed of the input shaft, also provides a second rotational speed, each of which may optionally be shifted to a rear-mounted gear set. The rear-mounted gear set comprises two shiftable planetary gear sets, which can shift at least seven gears using the six control elements, forming two power paths. During each shifting operation, range shifting is advantageously avoided. A 9-gear multi-speed transmission is further known from DE 29 36 969; it comprises eight control elements and four gear sets.

Automatic vehicle transmissions in planetary design in general have previously been described in the prior art on many occasions and undergo continuous developments and improvements. These transmissions should have, for example, a sufficient number of forward gears as well as one reverse gear and a gear ratio that is excellently suited for motor vehicles, having a high overall spread as well as favorable progressive ratios. Furthermore, they should have a high starting gear ratio in the forward direction and should include a direct gear, and should additionally be suited for use both in passenger cars and in commercial vehicles. In addition, these transmissions should have a low complexity, in particular they should require a small number of control elements, and should avoid double-shifts when shifting sequentially, so that always only one control element is engaged when shifting in defined gear groups.

SUMMARY OF THE INVENTION

It is therefore the object of the present invention to propose a multi-speed transmission of the type mentioned above in which the design complexity is simplified and furthermore the efficiency in the main driving gears, in terms of drag and gearing losses, is improved. Furthermore, it is intended that low torque act on the control elements and planetary gear sets in the multi-speed transmission according to the invention, and that the rotational speeds of the shafts, control elements and planetary gear sets be kept as low as possible. In addition, the required number of gears and the spread of the gear ratios are supposed to be increased, implementing advantageously seven forward gears and at least: one reverse gear. Furthermore, the transmission according to the invention is supposed to be suitable for any design in a vehicle, particularly for a frontal-transverse configuration.

According to the invention, a multi-speed transmission in planetary design is proposed, which has one input shaft and one output shaft, which are disposed in a housing. Furthermore, at least three planetary gear sets—hereinafter referred to as the first, second and third planetary gear sets—, at least six rotatable shafts—hereinafter referred to as the input shaft, output shaft, third, fourth, fifth and sixth shafts—and at least six control elements, comprising brakes and clutches, are provided; selective engagement of these components creates different gear ratios between the input shaft and the output shaft, so that preferably seven forward gears and one reverse gear can be implemented.

The input shaft is connected to the sun gear of the second planetary gear set and can be detachably connected, via a clutch, to the fifth shaft, which is permanently connected to the carrier of the third planetary gear set and can be detachably connected to the fourth shaft, via another clutch. According to the invention, the fourth shaft is permanently connected to the carrier of the second planetary gear set, can be coupled to the housing, via a brake, and detachably connected, via another clutch, to the sixth shaft, which is permanently connected to the sun gear of the third planetary gear set and to the ring gear of the first planetary gear set.

Furthermore, the third shaft is permanently connected to the ring gear of the second planetary gear set and to the carrier of the first planetary gear set, wherein the sun gear of the first planetary gear set is non-rotatably connected to the housing, and the output shaft is permanently connected to the ring gear of the third planetary gear set. According to the invention, either the fifth shaft can be coupled, via a brake, to the housing and the third shaft can be detachably connected, via a clutch, to the sixth shaft, or the third shaft can be coupled, via a brake, to the housing and can be detachably connected, via another clutch, to the fifth shaft.

The configuration of the multi-speed transmission according to the invention produces suitable gear ratios, particularly for passenger cars, as well as a considerable increase of the total spread of ratios of the multi-speed transmission, resulting in improved driving comfort and a significant improvement in fuel economy.

In addition, the multi-speed transmission according to the invention allows a considerable decrease in complexity to be achieved, due to the low number of control elements, preferably two brakes and four clutches. It is advantageously possible with the multi-speed transmission according to the invention to start driving with a hydrodynamic converter, a hydrodynamic clutch, an external starting clutch or other suitable external starting elements. It is also conceivable to allow a starting operation with a starting element that is integrated into the transmission. A control element, which is actuated in the first gear and in the reverse gear, is preferred.

In addition, good efficiency in the main driving gears, with regard to drag and gearing losses, can be achieved with the multi-speed transmission according to the invention.

Furthermore, low torque is present in the control elements and in the planetary gear sets of the multi-speed transmission, thus advantageously reducing the wear on the multi-speed transmission. In addition, the low torque makes correspondingly smaller dimensions possible, allowing reductions in the required installation space and the corresponding expenses. Also, the rotational speeds in the shafts, control elements and planetary gear sets are low.

In addition, the transmission according to the invention is designed such that it can be adjusted to different drive train configurations, both in the power flow direction and with regard to space.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be explained in more detail hereinafter with reference to the exemplary embodiments in the figures, wherein:

FIG. 1 is a schematic illustration of a preferred embodiment of a multi-speed transmission according to the invention;

FIG. 2 is an exemplary shifting pattern for the multi-speed transmission according to the invention from FIG. 1;

FIG. 3 is a schematic illustration of a further preferred embodiment of a multi-speed transmission according to the invention;

FIG. 4 is an exemplary shifting pattern for the multi-speed transmission according to the invention from FIG. 3;

FIG. 5 is a diagrammatic view of an embodiment of the inventive multi-speed transmission having a differential;

FIG. 6 is a diagrammatic view of an embodiment of the inventive multi-speed transmission with a coupling element and a drive motor;

FIG. 7 is a diagrammatic view of an embodiment of the inventive multi-speed transmission with a crankshaft of the drive motor fixed to an input shaft of the multi-speed transmission;

FIG. 8 is a diagrammatic view of an embodiment of the inventive multi-speed transmission having the drive motor communicating with a damper;

FIG. 9 is a diagrammatic view of an embodiment of the inventive multi-speed transmission with a power take-off for driving an additional unit;

FIG. 10 is a diagrammatic view of an embodiment of the inventive multi-speed transmission having a one-way clutch;

FIG. 11 is a diagrammatic view of an embodiment of the inventive multi-speed transmission with an electric machine;

FIG. 12 is a diagrammatic view of a preferred design of the inventive multi-speed transmission having a wear free brake;

FIG. 13 is a diagrammatic view of a further embodiment of the invention with the input and the output being provided on the same side of the multi-speed transmission housing; and

FIG. 14 is a diagrammatic view of another embodiment of the inventive multi-speed transmission with the crankshaft of the drive motor fixed to the input shaft of the multi-speed transmission and the coupling element located behind the multi-speed transmission.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a multi-speed transmission according to the invention comprising an input shaft 1 (An) and an output shaft 2 (Ab), which are disposed in a housing G. Three planetary gear sets P1, P2, P3 are provided, which are preferably configured as negative planetary gear sets and are arranged in the sequence P1, P2, P3 in the axial direction.

As can be seen from FIG. 1, only six control elements, namely two brakes 04, 05 and four clutches 15, 36, 45 and 46, are provided. With a selective engagement of these control elements, preferably seven forward gears and one reverse gear can be implemented. The multi-speed transmission according to the invention has a total of six rotatable shafts, namely the shafts 1, 2, 3, 4, 5 and 6.

According to the invention, it is provided in the multi-speed transmission according to FIG. 1 that the input is applied, via the shaft 1, which is permanently connected to the sun gear of the second planetary gear set P2 and can be detachably connected, via a clutch 15, to the shaft 5, which is permanently connected to the carrier of the third planetary gear set P3, can be coupled to the housing G, via the brake 05, and can be detachably connected to the shaft 4, via a clutch 45. The shaft 4 is permanently connected to the carrier of the second planetary gear set P2, can be coupled to the housing G, via a brake 04, and detachably connected, via a clutch 46, to the shaft 6, wherein the shaft 6 is permanently connected to the sun gear of the third planetary gear set P3 and to the ring gear of the first planetary gear set P1. Furthermore, the shaft 3 is permanently connected to the ring gear of the second planetary gear set P2 and to the carrier of the first planetary gear set P1 and can be detachably connected to the shaft 6, via a clutch 36, wherein the sun gear of the first planetary gear set P1 is non-rotatably connected to the housing G (shaft 0).

The output occurs via the shaft 2, which is permanently connected to the ring gear of the third planetary gear set P3.

Within the scope of the illustrated embodiment, the clutches 45 and 15 are disposed in front of the third planetary gear set P3 in the sequence of 15, 45 from an axial point of view in the power flow direction, and when they are disk clutches, they may have a common outer disk carrier.

The spatial configuration of the control elements is optional and is limited only by the dimensions and the outer shape.

FIG. 2 shows a shifting pattern of the multi-speed transmission of the invention according to FIG. 1 by way of example. For each gear, two control elements are engaged. The shifting pattern shows the respective gear ratios i of the individual gear steps and the resulting progressive ratios phi by way of example. The shifting pattern also shows that double-shifts and/or range shifts are avoided when shifting sequentially, because two adjoining gear steps jointly use one control element.

The first gear is defined by the engagement of brake 05 and the clutch 45, the second gear by the engagement of clutch 36 and the clutch 45, and the third gear is defined by the engagement of clutches 45 and 46. Furthermore, the fourth gear is defined by the engagement of clutch 15 and the clutch 45, the fifth gear by the engagement of clutches 15 and 46, the sixth gear by the engagement of clutch 36 and the clutch 15, and the seventh gear by the engagement of brake 04 and the clutch 15. As the shifting pattern shows, the reverse gear is defined by the engagement of brake 05 and the clutch 46.

According to the invention, initiating drive with an integrated control element is possible (IAK), for which particularly the brake 05 is suited, which is required in the first gear and the reverse gear. Furthermore, depending on the shifting logic, different gear steps may be obtained from the same gear pattern, allowing application- and/or vehicle-specific variations.

The embodiment shown in FIG. 3 differs from the embodiment according to FIG. 1 in that the shaft 3 can be detachably connected, via the clutch 35, to the shaft 5 and can be coupled to the housing G, via the brake 03, so that the brake 05 and the clutch 36 are eliminated. The corresponding shifting pattern is shown in FIG. 4. The first gear is defined by the engagement of brake 04 and the clutch 45, the second gear by the engagement of brake 03 and the clutch 45 and the third gear is defined by the engagement of clutches 45 and 46. Furthermore, the fourth gear is defined by the engagement of clutch 15 and the clutch 45, the fifth gear by the engagement of clutches 15 and 46, the sixth gear by the engagement of brake 03 and the clutch 15, and the seventh gear by the engagement of brake 04 and the clutch 15. As the shifting pattern shows, the reverse gear is defined by the engagement of clutch 35 and the brake 04. For starting with an integrated control element, in this embodiment particularly the brake 04 is suited, which is required in the first forward gear and the reverse gear.

In addition, as shown in FIG. 10, it is possible according to the invention to provide additional one-way clutches 38 in suitable locations of the multi-speed transmission, for example between a shaft and the housing, or to optionally connect two shafts.

On the input side or on the output side, an axle differential 20 and/or a transfer case may be provided according to the invention and shown in FIG. 5.

Within the scope of an advantageous further development as shown in FIG. 6, the input shaft 1 may be separated from a drive motor 30 as needed by a coupling element 24, wherein the coupling element may be a hydrodynamic converter, a hydraulic clutch, a dry starting clutch, a wet starting clutch, a magnetic powder clutch or a centrifugal clutch. It is also possible, as shown in FIG. 14, to provide such a driving element 25 in the power flow direction behind the transmission, wherein in this case the input shaft 1 is permanently connected to the crankshaft 32 of the drive motor 30 and shown in FIG. 7.

The multi-speed transmission according to the invention and shown in FIG. 8 also permits a torsional vibration damper 34 to be provided between the drive motor 30 and the transmission.

Within the scope of a further embodiment of the invention, shown in FIG. 12, a wear-free brake 42, such as a hydraulic or electric retarder or the like, may be provided on each shaft, preferably on the input shaft 1 or the output shaft 2, which is particularly important when the transmission is used in commercial vehicles. Furthermore, a power take-off 44 may be provided, as shown in FIG. 9, on each shaft, preferably on the input shaft 1 or the output shaft 2, to drive additional units 36. Additionally, as shown in FIG. 13, the input and the output are provided on the same side of the housing G.

The control elements that are used may be configured as power-shift clutches or power-shift brakes. In particular, friction-locking clutches or friction-locking brakes, such as multi-disk clutches, band brakes and/or cone clutches, may be used. Furthermore, it is also possible to use positive brakes and/or positive clutches, such as synchronization devices or claw clutches, as the control elements.

A further advantage of the multi-speed transmission presented here in FIG. 11, is that an electric machine 40 can be provided on each shaft as a generator and/or as an additional drive unit.

Of course, any design configuration, particularly any spatial configuration of the planetary gear sets and the control elements as such, as well as in relation to each other, falls under the scope of protection of the present claims, without influencing the function of the transmission as described in the claims, to the extent they are technically expedient, even if these embodiments are not explicitly illustrated in the figures or mentioned in the description.

Reference Symbols  0 Shaft  1 Shaft  2 Shaft  3 Shaft  4 Shaft  5 Shaft  6 Shaft 03 Brake 04 Brake 05 Brake 15 Clutch 35 Clutch 36 Clutch 45 Clutch 46 Clutch P1 Planetary gear set P2 Planetary gear set P3 Planetary gear set An Input Ab Output i Gear ratio phi Progressive ratio G Housing 

1. A multi-speed automatic transmission of a planetary design for a motor vehicle, the transmission comprising: an input shaft (1) and an output shaft (2) arranged in a housing (G); first, second and third planetary gear sets (P1, P2, P3), and each of the first, the second and the third planetary gear sets (P1, P2, P3) comprising a sun gear, a carrier and a ring gear; at least third, fourth, fifth and sixth rotatable shafts (3, 4, 5, 6) as well as six control elements (03, 04, 05, 15 35, 36, 45, 46), comprising first and second brakes (03, 04, 05) and first, second, third and fourth clutches (15, 35, 36, 45, 46), whose selective engagement of which creates different gear ratios between the input shaft (1) and the output shaft (2) so that at least first, second, third, fourth, fifth, sixth and seventh forward gears and a reverse gear can be implemented; wherein the input shaft (1) is permanently connected to the sun gear of the second planetary gear set (P2) and is detachably connected, via the first clutch (15), to the fifth shaft (5); the output shaft (2) is permanently connected to the ring gear of the third planetary gear set (P3); the third shaft (3) is permanently connected to the ring gear of the second planetary gear set (P2) and the carrier of the first planetary gear set (P1); the fourth shaft (4) is permanently connected to the carrier of the second planetary gear set (P2), is detachably connected, via the second brake (04), to the housing (G) and, via the fourth clutch (46), to the sixth shaft (6); the fifth shaft (5) is permanently connected to the carrier of the third planetary gear set (P3) and detachably connected, via the third clutch (45), to the fourth shaft (4); the sixth shaft (6) is permanently connected to the sun gear of the third planetary gear set (P3) and the ring gear of the first planetary gear set (P1); the sun gear of the first planetary gear set(P1) is fixed to the housing (G); and one of: the fifth shaft (5) is detachably connected, via the first brake (05), to the housing (G) and the third shaft (3) is detachably connected, via the second clutch (36), to the sixth shaft (6); and the third shaft (3) is detachably connected, via the first brake (03), to the housing (G) and, via the second clutch (35), to the fifth shaft (5).
 2. The multi-speed transmission according to claim 1, wherein the first, the second and the third planetary gear sets (P1, P2, P3) are arranged in an axial direction in the sequential order of: the first planetary gear set (P1), the second planetary gear set (P2) and the third planetary gear set (P3).
 3. The multi-speed transmission according to claim 1, wherein the first planetary gear set (P1), the second planetary gear set (P2) and the third planetary gear set (P3) are negative planetary gear sets.
 4. The multi-speed transmission according to claim 1, wherein the third clutch (45) and the first clutch (15) are arranged before the third planetary gearset (P3), in an axial direction, in the sequential order of: the first clutch (15) and the third clutch (45).
 5. The multi-speed transmission according to claim 1, wherein the first clutch (15) and the third clutch (45) are multi-disk clutches and have a common outer disk carrier.
 6. The multi-speed transmission according to claim 1, the at least seven forward gears result from one of the arrangements: if the fifth shaft (5) is coupled, via the first brake (05), to the housing (G) and the third shaft (3) is coupled, via second clutch (36), to the sixth shaft (6) then, first gear results from engagement of the first brake (05) and the third clutch (45), second gear results from engagement of the second clutch (36) and the third clutch (45), third gear results from engagement of the third clutch (45) and the fourth clutch (46), fourth gear results from engagement of the first clutch (15) and the third clutch (45), fifth gear results from engagement of the first clutch (15) and the fourth clutch (46), sixth gear results from engagement of the second clutch (36) and the first clutch (15), and seventh gear results from engagement of the second brake (04) and the first clutch (15); and if the third shaft (3) is coupled, via the first brake (03), to the housing (G) and, via the second clutch (35), to the fifth shaft (5), then the first gear results from engagement of the second brake (04) and the third clutch (45), the second gear results from engagement of the first brake (03) and the third clutch (45), the third gear results from engagement of the third clutch (45) and the fourth clutch (46), the fourth gear results from engagement of the first clutch (15) and the third clutch (45), the fifth gear results from engagement of the first clutch (15) and the fourth clutch (46), the sixth gear results from engagement of the first brake (03) and the first clutch (15) and the seventh gear results from engagement of the second brake (04) and the first clutch (15).
 7. The multi-speed transmission according to claim 1, wherein the reverse gear results in one of the following arrangements: if the fifth shaft (5) is coupled, via the first brake (05), to the housing (G) and the third shaft (3) is coupled, via second clutch (36), to the sixth shaft (6), then the reverse gear results from engagement of the first brake (05) and the fourth clutch (46); and if the third shaft (3) is coupled, via the first brake (03), to the housing (G) and, via the second clutch (35), to the fifth shaft (5), then the reverse gear results from engagement of the second brake (4) and the second clutch (35).
 8. The multi-speed transmission according to claim 1, wherein at least one one-way clutch is located within the transmission.
 9. The multi-speed transmission according to claim 8, wherein the at least one one-way clutch is located between the input shaft (1), the output shaft (2), the third shaft (3), the fourth shaft (4), the fifth shaft (5), and the sixth shaft (6) and the housing (G).
 10. The multi-speed transmission according to claim 1, wherein an input and an output of the transmission are located on a common side of the housing (G).
 11. The multi-speed transmission according to claim 1, wherein at least one of an axle differential and a transfer case differential is located on one of the input shaft (1) and the output shaft (2).
 12. The multi-speed transmission according to claim 1, wherein a coupling element facilitates separation of the input shaft (1) from a drive motor.
 13. The multi-speed transmission according to claim 12, wherein the coupling element is one of a hydrodynamic converter, a hydraulic clutch, a dry starting clutch, a wet starting clutch, a magnetic powder clutch and a centrifugal clutch.
 14. The multi-speed transmission according to claim 1, wherein an external driving element is located downstream of the transmission, in a direction of power flow, and the input shaft (1) is firmly connected to a crankshaft of a drive motor.
 15. The multi-speed transmission according to claim 1, wherein the vehicle is started via one of the six control elements (04, 05) of the transmission, and the input shaft (1) is permanently connected to a crankshaft of a drive motor.
 16. The multi-speed transmission according to claim 1, wherein a torsional vibration damper is located between a drive motor and the transmission.
 17. The multi-speed transmission according to claim 1, wherein a wear-free brake is arranged on at least one of the input shaft (1), the output shaft (2), the third shaft (3), the fourth shaft (4), the fifth shaft (5), and the sixth shaft (6).
 18. The multi-speed transmission according to claim 1, wherein a power take-off is arranged on at least one of the input shaft(1), the output shaft (2), the third shaft (3), the fourth shaft (4), the fifth shaft (5), and the sixth shaft (6) for driving an additional unit.
 19. The multi-speed transmission according to claim 18, wherein the additional unit is arranged on one of the input shaft (1) and the output shaft (2).
 20. The multi-speed transmission according to claim 1, wherein each of the six control elements are one of power-shift clutches and power-shift brakes.
 21. The multi-speed transmission according to claim 1, wherein each of the six control elements are one of multi-disk clutches, band brakes and cone clutches.
 22. The multi-speed transmission according to claim 1, wherein each of the six control elements are one of positive clutches and positive brakes.
 23. The multi-speed transmission according to claim 1, wherein an electric machine is arranged at least one of the input shaft (1), the output shaft (2), the third shaft (3), the fourth shaft (4), the fifth shaft (5), and the sixth shaft (6) as one of a generator and an additional drive unit. 